Ever heard of Perimeter Institute for Theoretical Physics (PI)? PI is one of the finest institutes for theoretical physics. It organizes a prestigious science camp every year for high schoolers.
The International Summer School for Young Physicists (ISSYP) is an exciting and challenging two-week program for Canadian and international high school students who have a keen interest in theoretical physics and intend to pursue physics studies at the university level and currently in the final two years of secondary school - 11th or 12th grade - and have not yet begun full-time studies at a post-secondary institution.
Application for ISSYP 2016 is open. More details on scholarship and application form can be found here: http://bit.ly/1bHodF6